root@mws64:~# echo 0 >  /sys/devices/system/cpu/cpu1/online 
root@mws64:~# lshw -class cpu
  *-cpu:0                 
       description: CPU
       product: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
       vendor: Advanced Micro Devices [AMD]
       physical id: 3
       bus info: cpu@0
       version: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
       slot: Socket M2
       size: 2GHz
       capacity: 3200MHz
       width: 64 bits
       clock: 240MHz
       capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp x86-64 3dnowext 3dnow up rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy cpufreq
  *-cpu:1
       description: CPU
       product: Athlon
       vendor: AMD
       physical id: 4
       bus info: cpu@1
       version: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
       slot: Socket M2
       size: 2400MHz
       capacity: 3200MHz
       clock: 240MHz
root@mws64:~# cat /proc/cpuinfo 
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 75
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
stepping        : 2
cpu MHz         : 2000.000
cache size      : 512 KB
physical id     : 0
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow up rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy
bogomips        : 4805.04
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc

root@mws64:~# echo 1 >  /sys/devices/system/cpu/cpu1/online 
root@mws64:~# cat /proc/cpuinfo 
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 75
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
stepping        : 2
cpu MHz         : 2000.000
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy
bogomips        : 4805.04
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc

processor       : 1
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 75
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
stepping        : 2
cpu MHz         : 2000.000
cache size      : 512 KB
physical id     : 0
siblings        : 2
core id         : 1
cpu cores       : 2
apicid          : 1
initial apicid  : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy
bogomips        : 4805.11
TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc

root@mws64:~# lshw -class cpu
  *-cpu:0                 
       description: CPU
       product: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
       vendor: Advanced Micro Devices [AMD]
       physical id: 3
       bus info: cpu@0
       version: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
       slot: Socket M2
       size: 2GHz
       capacity: 3200MHz
       width: 64 bits
       clock: 240MHz
       capabilities: fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp x86-64 3dnowext 3dnow rep_good nopl extd_apicid pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy cpufreq
  *-cpu:1
       description: CPU
       product: Athlon
       vendor: AMD
       physical id: 4
       bus info: cpu@1
       version: AMD Athlon(tm) 64 X2 Dual Core Processor 3800+
       slot: Socket M2
       size: 2GHz
       capacity: 3200MHz
       clock: 240MHz
       capabilities: cpufreq
root@mws64:~# uname -a
Linux mws64 2.6.39.3-mws64 #1 SMP PREEMPT Fri Jul 15 19:50:22 EEST 2011 x86_64 GNU/Linux

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